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150degF is 65degC. That's not too bad. The thermal cutback comes on at 75degC, and smoothly reduces max throttle until 85degC. The capacitor can be at 105degC all day for years. However, a finned heatsink would not be a bad idea. I was warned by Otmar (zilla) that it would be necessary, possibly with a fan, or liquid cooling. He made IGBT module controllers in the 90's and they were unreliable due to heat. The caps could have failed, which won't happen in our case. It could have been the IGBTs though. Do you want to try the spread spectrum switching? Or we can try higher frequency too (inaudible), and see the affect on heating.
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